A report on the artificial fertilization of the smallmouth yellowfish, <i>Barbus holubi</i> (Steindachner, 1894)

Mulder, P.F.S.; Franke, Gabriela

doi:10.1111/j.1095-8649.1973.tb04442.x

Cited by 2 publications

(5 citation statements)

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“…Time of first spawning since the summers of 1979/1980 was inferred from the time of capture of small juveniles in the riverine section, using information on incubation time and size in early life from le Roux (1968) and Mulder & Franke (1973). A 10 mm larva is approximately 10 days old at water temperatures of 19°-2 1 C. Spawning times prior to 1979/ 1980 were inferred from growth rates of juveniles in subsequent years.…”

Section: The Large Barbusmentioning

confidence: 99%

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Reproductive biology of four large riverine fishes (Cyprinidae) in a man-made lake, Orange River, South Africa

Tómasson¹,

Cambray²,

Jackson³

1984

Hydrobiologia

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The reproductive biology of Barbus holubi, B. kimberleyensis, Labeo capensis and L. umbratus was examined in a large reservoir on the Orange River, South Africa. The findings are integrated into the existing knowledge on large Barbus and Labeo species, which coexist in most river systems in Africa and Asia.Large Barbus spawn on gravel beds within the river channel during floods in spring or summer. In continuously flowing regulated rivers, time of spawning is governed by water temperatures. They have moderate fecundity; large eggs, incubation time of several days and the larvae are initially immobile with large yolk sacs. In the impoundment, they spawn in the inflowing regulated river with B. kimberleyensis spawning four to six weeks later than the more cold-tolerant B. holubi, the dominant large Barbus. Survival is generally good and the juveniles disperse throughout the lake, but unseasonal release of cold water from an upstream impoundment may cause poor reproductive success.In contrast, Labeo species generally spawn on newly flooded ground, usually leaving the main river channel. Spawning may or may not be preceded by a longitudinal migration. Labeos are relatively fecund with small (30% Barbus size) eggs which hatch quickly and the larvae swim in bursts up into the water column before sinking down again. L. capensis does not require a longitudinal spawning migration and breeds throughout the lake, depending on local conditions. Large temporal variation in gonadal development within the population can result in more than one spawning. Dispersal within the lake is poor. L. umbratus uses larger inflowing tributaries for spawning than L. capensis and its juveniles have a much greater power of dispersal. Early dependence on external feeding and undependable occurrence of conditions for spawning and juvenile feeding makes for variable reproductive success.

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Section: The Large Barbusmentioning

confidence: 99%

“…The fertilized eggs of B. holubi incubate for three to eight days at 18°-21.5 C, but larvae do not become mobile until four to six days after hatching (le Roux, 1968;Mulder & Franke, 1973). B. kimberleyensis have been bred artificially.…”

Section: Incubation and Early Life Historymentioning

confidence: 99%

Reproductive biology of four large riverine fishes (Cyprinidae) in a man-made lake, Orange River, South Africa

Tómasson¹,

Cambray²,

Jackson³

1984

Hydrobiologia

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“…Although the reproductive strategies of L. aeneus have been well documented, only limited information is available for L. kimberleyensis, specifically within riverine habitats. 13,14,27,28,50,51 In this study, only one possible spawning event, on 26 October 2007, was documented. This event involved abnormal vigorous interspecies shoaling behaviour of a group (n>5) of L. kimberleyensis, one of which was a tagged individual (LKIM8).…”

Section: Discussionmentioning

confidence: 90%

“…L. kimberleyensis are known to spawn 4 to 6 weeks later than the more cold-tolerant L. aeneus -a fact which is supported by our findings. 13,14,27,28 Numerous spawning events of tagged and other L. aeneus were, however, documented in the main stream of the Vaal River and in some smaller side channels. Findings confirm observations elsewhere 28,52 that L. aeneus spawning events are initiated when water temperatures in the Vaal River reach 18.5 °C, in late September to early October.…”

Section: Discussionmentioning

confidence: 99%

“…25 Adult yellowfish weighing 1050-6200 g were selected for the study to ensure that the transmitters did not exceed 2% of their mass, 26 as the effects of the tags were not evaluated directly. 13,27,28 Yellowfish were captured using various netting and angling techniques as well as a boat-mounted electrofisher (1 kV). The netting techniques included the use of monitored gill nets deployed in the evening and early morning, large fyke net traps and large seine nets.…”

Section: Tagging Methodsmentioning

confidence: 99%

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Habitat preferences and movement of adult yellowfishes in the Vaal River, South Africa

et al. 2013

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The yellowfishes of the Vaal River (Labeobarbus kimberleyensis and L. aeneus) are charismatic, socially and economically important fishes, but very little is known about their interspecies habitat preferences and movement. This study is the first behavioural study of yellowfish in the Vaal River using radio transmitters to characterise habitat preferences and movement patterns. A total of 22 adult L. kimberleyensis and 13 adult L. aeneus individuals were tracked for between 1 month and 1 year from 23 September 2006 to 16 May 2010. Radio telemetry revealed that yellowfish established routine daily behavioural patterns through which the habitat preferences and movement of the species could be established. Home ranges of the yellowfish ranged from 1 km to more than 12 km in the Vaal River depending on the species and habitat availability. Habitat preferences varied between species and included deep slow-flowing habitats with associated cover features particularly in winter for L. kimberleyensis and shallow fast-flowing habitats particularly for L. aeneus in spring, summer and autumn. Changes in flows, habitat availability and atmospheric pressure affected the movement of yellowfish. The biology and ecology of the yellowfish in the Vaal River is noticeably more complicated and dynamic than previously documented. We recommend that the behavioural ecology of these and other yellowfish populations in the Vaal River should continue to be characterised, and the use of the movement of yellowfish be developed as an indicator of ecosystem change. Study areaThe study was carried out in a reach of the middle Vaal River, southwest of Johannesburg (Figure 1). The study area is located within the Orange-Vaal River Yellowfish Conservation and Management Association (OVRYCMA) area. Site selection was based on local OVRYCMA member information, historical catch records for yellowfish, historical data 5 and initial field surveys to ascertain the presence of sufficient adult yellowfish individuals for the study. The approximately 190-km reach of the Vaal River selected for the study extends from Parys to an area upstream of Bothaville (Figure 1). Within this reach, both L. kimberleyensis and L. aeneus are abundant, 4 despite disturbances such as water abstraction for agriculture, industry and mine use, wastewater releases and the use of natural products. Habitat diversity was considered to be representative of the middle reach of the Vaal River and included a high diversity of both deep (>3 m) and shallow areas (<1 m) with slow-(0 m/s) and fast-flowing (1 m/s) biotope types. Although some gauging weirs and other barriers that may affect the movement of yellowfish exist in the study area, all of the yellowfish monitored in the study had access to relatively large reaches of the Vaal River (>35 km).

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A report on the artificial fertilization of the smallmouth yellowfish, Barbus holubi (Steindachner, 1894)

Cited by 2 publications

References 0 publications

Reproductive biology of four large riverine fishes (Cyprinidae) in a man-made lake, Orange River, South Africa

Reproductive biology of four large riverine fishes (Cyprinidae) in a man-made lake, Orange River, South Africa

Habitat preferences and movement of adult yellowfishes in the Vaal River, South Africa

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